Concept of Circuit switching, message switching and packet switching, their comparison and application. Computer Networks and concept of layering, OSI reference Model, Introduction to TCP/IP protocol suite and comparison of the OSI TCP/IP layered Models. Classification of networks under the heading LAN, WAN and MAN and their characteristics.

Unit IV Physical and Data link layer:

Error detection techniques such as Parity check, Vertical and longitudinal redundancy check, CRC code and their error detecting capabilities. Data link layer issues Point to point and multipoint links, flow control, sliding window protocol, various ARQ techniques for error and flow control and their comparison, SDLC, HDLC as bit oriented link control